Bloomberg: Fish guts may hold the answer to a mystery that’s puzzled ocean chemists for decades: Why seawater becomes more alkaline the deeper you go. Ocean waters become more alkaline, or less acidic, as carbonates produced by plankton dissolve. The chemical compounds typically don’t break down until a depth of several kilometers where the pressure is enough, said Rod Wilson, lead author of a study today in the journal Science. The ocean’s alkalinity increases by about 4 percent in the first …